<template>
    <el-breadcrumb class="app-breadcrumb" separator="/">
        <transition-group name="breadcrumb">
            <el-breadcrumb-item v-for="(item, index) in levelList" :key="item.path">
        <span v-if="item.redirect === 'noRedirect' || index == levelList.length - 1" class="no-redirect">{{
                item.meta.title
            }}</span>
                <a v-else @click.prevent="handleLink(item)">{{ item.meta.title }}</a>
            </el-breadcrumb-item>
        </transition-group>
    </el-breadcrumb>
</template>

<script setup>
const route = useRoute();
const router = useRouter();
const levelList = ref([]);

function getBreadcrumb() {
    // only show routes with meta.title
    let matched = route.matched.filter((item) => item.meta && item.meta.title);
    const first = matched[0];
    // 判断是否为首页
    if (!isDashboard(first)) {
        matched = [{path: '/index', meta: {title: '首页'}}].concat(matched);
    }

    levelList.value = matched.filter((item) => item.meta && item.meta.title && item.meta.breadcrumb !== false);
}

function isDashboard(route) {
    const name = route && route.name;
    if (!name) {
        return false;
    }
    return name.trim() === 'Index';
}

function handleLink(item) {
    const {redirect, path} = item;
    if (redirect) {
        router.push(redirect);
        return;
    }
    router.push(path);
}

watchEffect(() => {
    // if you go to the redirect page, do not update the breadcrumbs
    if (route.path.startsWith('/redirect/')) {
        return;
    }
    getBreadcrumb();
});

getBreadcrumb();
</script>

<style lang="scss" scoped>
.app-breadcrumb.el-breadcrumb {
  display: inline-block;
  font-size: 14px;
  line-height: 50px;
  margin-left: 8px;

  .no-redirect {
    color: #97a8be;
    cursor: text;
  }
}
</style>
